Typewriting-machine



A. G. F. KUROW'SKI.

TYPEWRITING MACHINE.

APPLICATION FILED s10v.21, 1918.

1,883,643.. Pat nted July 5, 1921.

2 SHEETSSHEET l.

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a: wummm I E 1 l I A. G. F. KUROWSKI.

TYPEWRITING MACHINE.

APPLICATIONFILED NOV. 21. 1918.

.l.,38. ,,643., Patented July 5, 1921,

2 SHEETSSHEET 2.

Afforfiey FFICE.

ALFRED G. F. KUROWSKI, OF BROOKLYN, NEW YORK, ASSIGNOR 'IO UNDERWOOD TYPEWRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING-MACHINE.

Specification of Letters Patent.

Patented July 5, mp1.

Application filed November 21, 1918. Serial No. 263,480.

This invention relates to typewriting machines, and more particularly to improvements in escapement mechanisms therefor.

In the usual Underwood escapement mechanism, upon movement of the universal frame, due to depression of a type key or the space bar, the loose dog is moved out of a notch of the escapement wheel and the fast dog is moved into the notch just vacated. The loose dog, upon release, is

moved against its stop by a spring and so positioned that, upon the return movement of the dogs, it will enter another notch of the escapement wheel and be returned to its normal position. The main object of my invention is to provide an improved mechanism in which the noise due to the striking of the loose pawl against its stop will be eliminated and which will be adapted to secure a smooth, rapid and certain operation of the parts.

In the embodiment of the invention herein disclosed, the fast and loose dogs are replaced by a toothed detent member normally positioned so that movement of the escapement wheel will be prevented by engagement of a'tooth thereof with the side of a tooth of the detent member.

The teeth of the escapement wheel and detent member aregso shaped that, upon release of the escapement wheel, due to movement of the detent member, the escapement wheel, under the influence of the springurged carriage, will effect an additional movement of said detent member to another effective position.

The present invention avoids the noise caused by the blow of the loose dog against Other features and advantages will here'- mafter appear.

In the accompanying drawings, 7 Figure 1 is a sectional side elevation of an Underwood typewriting machine with the present invention applied thereto.

Fig. 2 is a plan View of the escapement wheel and the controlling means therefor.

Fig. 3 is a View on a larger scale of some of the parts shown in Fig. 1.

Fig. 4 is a fragmentary perspective View of the parts shown in Fig. 2.

Figs. 5, 6 and 7 are views showing, respectlvely, the relative position of the teeth of the escapement wheel and the detent wheel in normal position, in the position assumed escapement wheel.

Character keys 1, mounted on levers 2, act, through bell-cranks to swing typebars 4 against the front of platen 5 supported on carriage 6. Said carriage 6 is supported by sliding movements on rods 7 and 8 and is given a step-by-step movement by suitable escapement mechanism. A rack 9 is carried by arms 10 pivoted on carriage 6, and meshes with pinion 11, which has a usual one-way driving connection with the escapement wheel 12 controlled by mechanism hereinafter described. Said carriage 6 is'normally urged in one direction by means of the usual strap 13 and springdrum 14.

The escapement wheel 12 is released by engagement of a heel 15 on one of the typebars, upon depression of the corresponding key, with a universal bar 16 forming part of a usual movable frame 17, which in turn actuates the detent mechanism. Said frame 17 is normally held in forward position by a spring 18 attached at one end to a bracket 19 mounted on a fixed portion of the frame.

In the present invention, the escapement wheel 12, formed with inclined teeth 20, is substantially in the form of a spiral or screw gear, and is normally held against movement by the engagement of a tooth 20 thereon with a tooth 21 of a detent wheel 22 mounted on shaft 23 extending transversely of the machine. Secured for movement with said detent wheel 22 is a ratchet wheel 24 actuated by a pawl 25, pivotally mounted on frame 17 and held by a spring 26 in engagement with said ratchet wheel 24. Detent wheel 22' is.

also in the general form of a spiral or screw gear but may be described more specifically as a spiral gear merging into a spur gear. Obviously detent wheel 22 may be replaced by a spiral gear and a spur gear in fixed relation to each other.

It will be seen that movement of pawl 25, due to engagement of the universal bar 16 by a type-bar, will not be sufficient to move the ratchet wheel the distance of one tooth, but will move the ratchet wheel and the detent associated therewith sufficiently to bring the space between two teeth of the detent wheel opposite a tooth of the escapement wheel, as shown in Fig. 6. The tooth 20 of the escapement wheel opposite such a space will thereafter, under the influence of said spring-' drum 14, exert a camming action on a tooth 21 of the detent wheel and move said detent wheel into the position shown in Fig. 7.

Preferably each tooth121 of detent wheel 22 is formed in two parts, a portion 27 adjacent the front face of said detent wheel and inclined with respect thereto, and a portion 28 adjacent the rear face and perpendicular thereto. As herein designated, the front face of the detent wheel is that with which the tooth of the escapement wheel is normally in engagement. Preferably also teeth 21 are so spaced as to allow teeth 20 to passfreely therebetween but without unnecessary-play. It will be seen that a tooth 20 in passing between inclined portions 27 of teeth 21 will serve to advance detent wheel 22. and in passing between portions 28, will prevent movement of said detent wheel until the next tooth 20 comes into engagement with the front face of said detent wheel.

Furthermore, the spaces between teeth 20 are less in extent than the thickness of detent wheel 22, and, therefore, as one tooth of the escapement wheel is brought into engagement with the side of a detent wheel tooth, the preceding escapement wheel tooth will lie within the space between two successive detent wheel teeth and in this position will prevent retrograde movement of the detent wheel. For the purpose of giving proper engagement with teeth 21, teeth 20 are cut away at 29; and to permit forward movement of detent wheel 22 to place a tooth 20 in position to pass from the position shown in Fig. 5 to that shown in .Fig. 6, each tooth 20 must be cut away at 30. As will be evident from inspection of Fig. 7., it is also necessary to cut away a portion of each tooth 21 at 81 to permit the preliminary advance of said detent wheel 22.

The throw of pawl 25 is sufficient to advance detent wheel 22 only to a position to release the escapement wheel 12. However,

overthrow of said detent wheel 22 might bring another tooth thereof into position to prevent movement of said escapement wheel '12. To prevent such. action, an overthrow stop 32 is attached to frame 17, and so positioned-that at the end of the driving stroke of pawl 25, said overthrow stop 32 will engage a tooth of said ratchet wheel 24 as shown in Fig. 3.

To recapitulate, the operation of the improved escapement mechanism is as follows:

At the end of the printing movement ofa type-bar 4, the heel 15 thereof will engage the universal bar 16 and, through intermediate parts, advance detent wheel 22 sufliciently to permit movement of the escapement wheel 12, overthrow of said escapement wheel being prevented by engagement of overthrow stop 32 with said ratchet wheel 24. It will be seen that movement of the escapement wheel is permitted before the type-bar reaches the end of its forward stroke, and consequently that the escapement device herein disclosed is adapted for rapid work. limmediately after the preliminary movement of the detent wheel, escapement wheel 12 will be moved under the urging of spring-drum 14, and the tooth 20 in operative engagement with a tooth 21 of detent wheel 22 will exert ment-wheel, said detent-wheel having teeth spaced so as to enable teeth of the escapement-wheel to pass therebetween, a tooth of said detent-wheel being normally in the path of movement of a tooth of the escapementwheel, to block movement of the latter, and means to advance said detent-wheel, step by step, to permit the tooth of the escapementwheel, previously in blocked position, to enter between two teeth of the detent-wheel, the teeth of said wheels being angularly disposed with respect to their axes, so that upon movement of the tooth of the escapementwheel between two teeth of the detent-wheel,

the latter wheel will be actuated by the former until the next tooth of the detent-wheel is brought into the path of the next tooth of the escapement-wheel.

2, In a typewriting machine, the combination wlth an escapement-wheel having teeth on its periphery angularly disposed with respect to its axis and normally urged to turn in one direction, of a spiralgear for controlling said escapement-wheel, a' tooth 1 of said spiral gear being normally in the path of movementof a tooth of said escapement-wheel, a spur gear behind said spiral gear andfixed relatively thereto, the teeth of the spiral gear and spur gear being in register with each other, and means for advancing said spiral gear, step by step, to permit a tooth of the escapement-wheelrto enter between two teeth of the spiral gear, the teeth ofthe escapement-wheel in passing between the teeth of the spiral gear acting to advance thelatter, so that a tooth thereof will be brought into effective position, and in passing between the teeth of the spur gear to hold the spur and spiral gears against movement to insure engagement of the next tooth of the spiral gear by the next tooth 'of the escapement-wheel.

3. In a typewriting machine, the combi-.

nation with an escapement wheel having teeth on its periphery angularly-disposed with respect .to its axis and normally urged to turn in one direction, of a spiral gear for controlling said escapement wheel, said spiral gear having teeth spaced to enable teeth of said escapement wheel to pass therebetween, a tooth of said spiral gear being nor.-

- mally in the path of movement of a tooth of the escapement wheel, and means for advancing said spiral gear step by step, to permit said escapement wheel to turn and advance said spiral gear into a position to again place a tooth thereof in position to prevent movement of said escapement wheel.

4. In a typewriting machine, thecombination with an escapement wheel having teeth on its periphery and means for turning the same in one direction, of a spiral gear, the teeth of said spiral gear being spaced to permit teeth of said escapement wheel to passtherebetween, and a tooth of said spiral gear being normally in engagement with a tooth of said escapement wheel to prevent movement thereof by said turning means, and means for advancing said spiral gear to bring a space between the teeth thereof opposite the spiral gear tooth previously engaged, and thereby render said escapement-wheel-turning means effective to advance said spiral gear another step to again place a tooth thereof in engagement with a tooth of said escapement wheel.

between, a tooth of the escapement wheel being normally pressed against the side of a tooth of the spiral gear, and means to advance said spiral gear to bring a space between the teeth thereof opposi e the previously engaged tooth of said escapement .due to said urging device, said escapement member having camming teeth thereon, a

detent member having inclined teeth spaced so as "to permit the teeth of said escapement member to pass therebetween, a tooth of said escapement member normally pressing against the side of a tooth of said de-.

tent member, and means to advance said detent member to bring a space between the teeth thereon opposite the previously engaged tooth of said escapement member,

and thereby permit said escapement member acting under the influence of said urging device to again place a tooth of said detent member in the path of a tooth of said escapement member.

7. In a typewrlting machine, the combination with a spiral gear and turning means urging the same in one direction, of asecond spiral gear substantially at right angles to the first having teeth so spaced as to permit teeth of.the first-named spiral gear to pass therebetween, each tooth of the second spiral gear having a portion inclined to the faces thereof, and a ortion at right angles to said faces, where y a tooth of the first spiral gear in passing between teeth of the second spiral gear, under urging of said turning means, will turn said second spiral gear during passage between the inclined portions of two teeth, and will hold said second spiral gear against movement during the latter part of its passage. v, v

8. In a typewriting machine, the combination with an escapement wheel and turning means urging the same in one direction, of means for controlling the action of saidescapement wheel, comprising a detent wheel and connections between said escapement wheel and detent. wheel, whereby said escapement wheel will be held against movement, with the detent wheel in certain posi- I,

tions, but will be permitted to move, upon suitable movement of said detent wheel, and

will thereafter effect movement of said detent wheel to another operative position.

9. In a typewriting machine, the combination with a traveling carriage, of means for controlling the movement thereof, comprising a toothed escapement wheel, a spiral detent-wheel having teeth spaced to permit passage therebetween of the teeth of the escapement wheel, said escapement wheel being normally held against movement by'engagement of a tooth thereof against the side of a tooth-of said detent wheel, means for advancing said detent wheel to withdraw its obstructlng tooth from engagement with an escapementwheel tooth, and means for turning said escapement wheel, effective to move the previously-engaged escapement-' wheel tooth into a space between two detent wheel teeth, and thereby effect an additional movement of said detent Wheel to again bring a tooth into position to present a side thereof for engagement with a 'tooth of said escapement wheel.

10. In a typewriting machine, the combination with a carriage, a platen mounted thereon and type-bars mounted to be swung against said platen, of carriage-controlling means, comprising an escapement wheel, a detent member therefor, means to move said detent member to an ineffective positionduring the latter part of theprinting stroke of a type-bar, and escapement-wheel-actuating means permitted to act upon movement of said detent member to ineffective position, said escapement-wheel then acting on said 4 detent member to effect an additional movement thereof to place the same in another effective position.

11. In a typewriting machine, the combination with a carriage, of feeding means therefor, comprising an escapement wheel having cam-shaped teeth, a detent wheel therefor in the form of a spiral-gear and having teeth providing Icam paths therebetween for, passage of said cam-shaped teeth,

' means to advance said .detent wheel to a position to permit a cam-shaped tooth toenter one of said cam paths, means to prevent overthrow of said detent wheel by said advancing means, and escapement-wheel-actuating means for driving a cam-shaped tooth through a cam path which it has been permitted to enter,'and thereby advancing said detent wheel to another effective position.

12. In atypewriting machine, the combination with a carriage, a platen and type- 'bars mounted to be swung against said platen, of controlling means for said carriage, including a toothed escapement wheel, a toothed detent wheel normally positioned so that the side of a tooth thereof will be engaged by a tooth of said escapement wheel,

' andtype-bar-actuated means for. advancing engaged escapement-wheel tooth to pass bethe detent wheel to permit the previously tween the previously engaged detent-wheel tooth and the succeeding tooth, comprising a ratchet wheel fixed to turn with said detent wheel, a pawl, a pawl-carrying frame, and

' an overthrow stop carried by said pawlcarrying frame.

13. In a typewriting machine, the combination with. a traveling carriage, of feeding mechanism therefor, comprising an escapement wheel, a detent wheel effective in certam positlons to prevent movement of said escapement wheel and ineffective in others,-

and means for advancing said detent wheel to ineffective position, said escapement wheel being effective for continuing the adeffective position is reached.

14. In a typewriting machine, the'combi- Vance of said detent wheel until another nation with a traveling carriage and character keys, of feeding mechanism for said travehng carriage, comprismg' an escapement wheel, a detent wheel effectlve 1n certain positions to prevent movement of said escapement wheel and, ineffective in others, and character-key-ac tuated means for advancing said detent'wheel to an ineffective "position at the end of the down stroke of a character key, the teeth on said wheels being so. shaped that the advance of said detent wheel may be continued by said escapement wheel until another effective posi-v tion is reached.

15. In a typewriting machine, the combination with a traveling member, of feeding mechanism therefor, comprising a toothed escapement wheel, a toothed detent wheel effective in certain positions to place -a nation with a traveling carriage, of feeding mechanism therefor, comprising an escapement wheel having teeth, on its periphery angularly disposed with respect to its 'axis and extending thereacross, and a detent wheel in the form of a' spiral gear, the teeth of said gear being spaced so as to permit teeth of said escapement wheel to pass therebetween, the teeth of said escapement wheel being so spaced that with one tooth thereof in engagement with the side of a detent-wheel tooth, the rear portion of the preceding escapement-w-heel tooth will lie within a space between two detent-wheel teeth.

' 17. Ina typewriting machine, the combi nation with a carriage, of feeding means therefor, comprising anescapement wheel having-teeth on its periphery angularly disposed with respect to its axis, a detent wheel in the form of a spiral gear, the teeth of said gear being spaced to p'ermlt escapementwheel teeth to pass therebetwe'en, means for advancing said detent wheel to permit an another effective position, and means tc escapement-wheel tooth to enter the space prevent overthrow of said detent wheel, due between two successive detent-wheel teeth, "to the actlon ofsaid drivin means.

means rendered effective by the advance of ALFRED G; F. UROWSKIQ 5 the said detent wheel for driving said es- 'Witnesses:

capement wheel, said escapement wheel ef EDITH B. LIPPEY,

fecting advance of said detent wheel to JENNIE P. THORNE. 

